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Poster: leftwinger57 Date: Oct 14, 2012 3:52am
Forum: GratefulDead Subject: tech talk e 72

With all the talk surrounding E72 lately I began to wonder about something.I'm just a fountain of questions.All the Dead's gear was of course at the time mostly U.S. made Fenders and worked off of our power grid of 110-120volts.I believe in Europe and else where the power grid is 220v. So how is this conversion made?Do they rent 110 generators?I have to know this.

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Poster: light into ashes Date: Oct 14, 2012 12:49pm
Forum: GratefulDead Subject: Re: tech talk e 72

I think the E72 box set booklet makes reference to this, though I don't remember what it was...
Of course, all the US musicians who went to Europe had to deal with this too; by '72 it would have been well-worked out. I remember Hendrix, when he went over in '70, had some difficulties with the conversion, and some of his guitar effects had a much more pronounced sound on the last Europe tour. (This could be one cause of his inability to control the sound at the Isle of Wight show.)

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Poster: duckpond74 Date: Oct 14, 2012 8:12am
Forum: GratefulDead Subject: Re: tech talk e 72

There are heavy duty power converters, or 'step-down' converters that are made either as a hand-sized box power converter, that also accepts the US AC plug type and and makes the correct power conversion. There are also multiple input power strips designed to make the plug type and power conversion safely, and quietly, with no generators or other plug adapters needed. We have the similar, but 'opposite', type of equipment in North America to handle the European plug type and power needs to convert from 220v to 110v. I hope that makes sense to you. They would have carried these with them from gig to gig, or the promoter or venue at each stop would supply the needed equipment.

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Poster: leftwinger57 Date: Oct 14, 2012 1:16pm
Forum: GratefulDead Subject: Re: tech talk e 72

Fantastic,it makes perfect sense and clearly it was an issue and had to resolved by electricians and engineers.One thing I do remember was the Pink Floyd Yankee Stadium show in 94'
Outside all along Jerome Ave. was generating trucks and big semis at that.I think all told 4 trucks clearly a stadium gig is no comparison to theaters and w/ a show as spectacular as that a plug strip would never do....

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Poster: Lou Davenport Date: Oct 15, 2012 5:59pm
Forum: GratefulDead Subject: Re: tech talk e 72

From the E72 book: "Ours was a 60-Hz machine and we were going to 50-Hz land. Ron came up with a solution that would solve another problem down the road. He built a precision 60-Hz crystal oscillator; we drove a Mackintosh 275 vacuum-tube amplifier and picked off a tap on the output transformer, which would give us 120 volts with enough current to run our the capstan motor at our precise 60 Hz/15 ips, also now immune to line-frequency fluctuation."

Interestingly, I think that's basically the same principle used by PS Audio for their Power Plant series of regenerative AC synthesizers.